| Wireless mesh network is a new broadband network with multi-hop and multi-channel. With the appearance of the technology of multi-radio and multi-channel in networks, wireless mesh network develops greatly. Advanced signal technology promotes the birth of multi-radio and Multi-Channel Mesh Network.In multi-radio and multi-channel mesh network, the superior network communication performance is depended on the high-ranking channel allocation algorithm and routing optimization algorithm. Therefore, the channel allocation algorithm and routing optimization algorithm become the focus of this paper; the major works are as follows:Firstly, the relevant concept, structure, characteristics, technologies and applications of WMNs are briefly introduced.Secondly, we review the research on quality of Service in WMN, and recent studies of channel assignment and routing optimization algorithms in MRMC-WMN.Thirdly, the structure, network characteristics and interference conditions of MRMC-WMN are analyzed, and a channel assignment model with connectivity is established. Based on this model, a channel assignment model is proposed, which incorporates the connectivity and anti-jamming capability of network. A heuristic algorithm is proposed to solve the optimization model. The simulation results demonstrate the effectiveness of the algorithm.Finally, based on the channel assignment model introduced in Chapter 3,an improved algorithm with new PREQ message structure is given, which completes the computation of node load and enhances the node congestion control. The key of the algorithm is to add load information in the PREQ frames so that the nodes in the network can realize the load of surrounding neighbors, and make appropriate route choices. This algorithm can balance network traffic and avoid congestion by considering both routing metric and load of neighbors, and balance the network flow distribution. The simulation results demonstrate the good performance. |
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